Joan is an elderly female who had her right knee replaced 3 days ago secondary to osteoarthritis. She is receiving nursing care for pain management, assistance with functional mobility an

Joan is an elderly female who had her right knee replaced 3 days ago secondary to osteoarthritis. She is receiving nursing care for pain management, assistance with functional mobility and wound care. She will begin physical therapy for transfers and ambulation training. Today, Joan needs her dressing changed.
The old dressing is removed, and the nurse notes a moderate amount of serosanguinous drainage on the gauze. The nurse performs the dressing change. The nurse provides health teaching about her wound once at home.
Clinical Reasoning: surgical incisions are usually not measured, yet ulcer wounds (venous, arterial, pressure) are. Explain this.